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Person J. J. Thomson
Asked 2 times across 2 UPSC exams over 8 years (2017–2025), peaking in 2017.
Key insights
- Most tested in CDS — 1 of 2 PYQs
- Most asked in 2017
- Recurs across 2 years (2017–2025)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
CDS 2017 → NDA 2025
How the concept evolved
Rising — more than half its appearances (2 of 2) are since 2016.
Related concepts
Ideas UPSC tests alongside this one — keep exploring.
Sample questions
You've seen the pattern — here are a few of the actual PYQs.
NDA2025
Which one of the following statements is correct?
- A A neutron is formed by combination of an electron and a proton. Therefore, it is neutral
- B The mass of an electron is about 1/2000 times that of a proton ✓
- C An isotope of cobalt is used in the treatment of goiter
- D J. J. Thomson proposed that the nucleus of an atom contains only neutrons
✓ Correct answer: (B)
Science & Technology › Physics & Chemistry
CDS2017
'Plum Pudding Model' for an atom was proposed by
- A Antoine Lavoisier
- B Robert Boyle
- C Ernest Rutherford
- D J. J. Thomson ✓
✓ Correct answer: (D)
Science & Technology › Physics & Chemistry
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